鸡翅膀内初级传入和内脏传出纤维的来源——HRP逆行追踪法研究

The origin of primary afferent, somatic efferent and visceral efferent fibers in chick wing

用改良HRP逆行追踪法研究了鸡翅膀主要神经干的感觉神经纤维、内脏运动神经纤维的起源细胞,分别计数C10～T6脊神经节内感觉神经元、交感干神经节内的内脏运动神经元的数量,并进行统计学分析,结果表明:1鸡翅膀内主要神经干的初级传入神经元属假单极神经元,数量多,以中型细胞为主,均位于C12～T3之间,高峰节段为T1,神经元的数量由高峰节段向头端和尾端渐减或锐减.2内脏传出纤维来源于C12～T3之间交感干神经节的多极神经元,高峰节段位于C14和T1两个节段,分布范围较相应初级传入要缩短一个节段,且神经元数量较多.3躯体传出神经元为位于C12～T3脊髓腹角的大多极神经元,分布节段与内脏传出神经元相似,正中神经和尺神经的标记细胞定位于腹角的背外侧,腋神经和桡神经定位于腹角的腹内侧.

HRP retrograde tracing method was adopted to explore the origin cells of the primary somatic afferent fibers and visceral efferent fibers of the nervous trunks in chick wing. The number of the labeled neurons of dorsal root ganglions, sympathetic trunk ganglions, and the respective segment of spinal cord was counted. The results are summarized below: ①The labeled primary neurons of all nervous trunks of chick wing were mainly located in C12 to T3 dorsal root ganglions. The peak ganglion located at T1. Forward and backward, the labeled cells decreased gradually. Most labeled cells are mediumsized pseudounipolar neurons. ②The visceral efferent fibers originated from C12 to T3 sympathetic trunk ganglions. The peak ganglion was C14 and T1. ③The somatic efferent neurons distributed between C12 to T3 segment of spinal cord. Most of these labeled cells are multipolar neurons. The ulnar nerve and radial nerve derived from the dorsolateral region of the spinal cord. Accordingly, the auxiliary nerve originated from the ventromedial region of the spinal cord.